JPH0739886Y2 - Paper feeder - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention is applied to a box making machine for corrugated cardboard sheets,
The present invention relates to a paper feeding device that sequentially carries out paperboard (corrugated cardboard sheet or the like) one by one to a downstream process.

(Prior Art) FIG. 3 is a diagram for explaining the operation of a conventional paperboard feeder of the lead edge system, and FIGS. 4 and 5 are diagrams for explaining the problems of the conventional paper feeder. In general, the paper feed unit of the corrugated board box box making machine is a device for sequentially carrying out the corrugated board sheets 1 stacked on the paper feed table 16 one by one from the lowermost layer via the delivery roll 4.

In the figure, the sheet stopper 3 can be moved back and forth (between 3 and 3 ') on the sheet feeding table 16 as shown in FIG. 3, and can be fixed at an arbitrary position corresponding to the length of the corrugated board sheet 1 in the sheet feeding direction. The corrugated cardboard sheets 1 loaded in the preceding step (not shown) come into contact with the front guides 2 and fall, and are sequentially stacked with the sheet stoppers 3. A plurality of delivery rolls 4 are provided below the lowermost sheet 1a so as to project slightly above the paper feed table 16. Reference numeral 6 is a suction box, the inside of which is connected to a vacuum pump or a suction blower 8 via a duct 7.

In the above configuration, the suction box 6 is in a substantially sealed state by blocking the upper surface with the lowermost sheet 1a, and a negative pressure region is formed inside by operating the suction blower 8, so that the lowermost sheet is formed. It functions to increase the frictional force Fo between 1a and the delivery roll 4. On the other hand, a frictional force F is generated on the upper surface of the lowermost sheet 1a due to the weight (direct pressure) of the sheets stacked above the second-stage sheet 1b, and the lowermost sheet 1a is generated on the upper and lower surfaces of the sheet. Difference in friction force (conveyance force acting on the sheet f =
Fo-F), and is further conveyed to a downstream process (printing unit) by holding and rotating the feed rolls 5a and 5b provided downstream.

(Problems to be Solved by the Invention) As described above, in the conventional sheet feeding device, the lower end gap of the front guide 2 is set to be slightly wider than the thickness of the paper board 1 by a gap adjusting device (not shown). Paperboard 1
The height of the leading edge of the paperboard 1 from the upper surface of the paper feed table 16 varies depending on the degree of deformation of the paperboard 1, such as a warped state (upward warp, downward warp), a curved state, etc., and thus it is necessary to readjust each time. there were. Further, when the gap is inappropriate, for example, when the gap is small with respect to the amount of warp deformation as shown in FIG. 4, the leading end of the sheet 1a collides with the lower end of the front guide 2. Further, in the modified state as described above, the sheet 1a
The negative pressure in the suction box 6 does not increase due to the inflow of the external air from the tip clearance of the sheet, and the frictional force Fo between the lowermost sheet 1a and the outer peripheral surface of the delivery roll 4 decreases.
The sheet carrying output f decreases. Since this tendency substantially corresponds to the warp deformation amount of the sheet, there is a problem that it becomes more remarkable as the sheet dimension becomes longer.

In view of the above-mentioned problems, if the lower end gap of the front guide 2 is set to be wide with respect to sheet deformation (warp), when undeformed sheets are stacked as shown in FIG.
A phenomenon of two-sheet feeding occurs in which the lowermost sheet 1a to be carried out and the second-stage sheet 1b to be carried out next are simultaneously sent out.

As described above, the conventional paper feeding apparatus leaves these unstable elements, and the deviation of the paper feeding timing (deviation of the deviation amount) is apt to occur, which causes the deterioration of the quality in the next process such as the change of the printing position. Further, when a sheet unloading trouble such as a paper feeding error (for example, feeding two sheets) occurs, it is necessary to stop the machine and take measures, which causes a problem that productivity is significantly reduced.

Therefore, the conventional sheet feeding device is not provided with a function such that the deformed (upward warped or downward warped) paperboard can be reliably carried out by engaging the carrying-out means. On the other hand, a method has been adopted in which the curving behavior is manually corrected to some extent, and then the curving behavior is stacked on the table or the paper feeding speed is reduced. However, this method is not only time-consuming to correct, but also cannot be completely corrected. In particular, in the case of long-sized paperboard, the amount of warp deformation varies greatly, and a paper feed error (two sheets are fed, do not carry it out,
Various defective papers are likely to occur due to variations in the paper feed timing), and the machine may be stopped to repair the worst troubles, leaving a large instability factor such as deterioration in quality and productivity.

The present invention has been proposed to solve the above conventional problems.

(Means for Solving the Problem) For this reason, the present invention provides a device between the front guide and the sheet stopper that supports the rear end of the paperboard configured to be movable back and forth according to the length of the paperboard to be stacked. In a paper feeding device equipped with a feeding roll that sequentially carries out stacked paperboards from the lowermost layer, when the paperboard dimension exceeds a predetermined length, the sheet stoppers are automatically moved up and down and tilted in conjunction with this length variation. A mechanism is provided and this is used as a means for solving the problem.

(Operation) By raising the rear end side of the corrugated board sheet in accordance with the sheet length, the front end portion of the sheet can be brought into close engagement with the upper surface of the suction box. In this way, the lower surface of the front end of the corrugated cardboard sheet that is deformed (warped) or curved can be stably adsorbed along the suction surface of the upper sheet of the suction box, and the frictional force between the delivery roll and the lower surface of the lowermost sheet can be reduced. Can be increased. Therefore, in combination with the effect of transferring the intermediate conveyor belt and rolls, the sheet can be reliably carried out, and the feeding timing becomes accurate, so that the processing accuracy in the downstream process such as printing is improved.

(Embodiment) Hereinafter, the present invention will be described with reference to the embodiments of the drawings. FIG. 1 and FIG. 2 show an embodiment of the present invention, and FIG. 1 is a schematic structural explanatory view of a paperboard feeder of the present invention. FIG. 2 is a functional explanatory view of the same apparatus, and the alternate long and short dash line shows the conventional seat state.

Now, the paperboard feeding device in FIG. 1 can be moved up and down according to the thickness of the paperboard 1, and the front guide 2 configured to variably set the gap amount at the lower end and the length of the paperboard 1 to be stacked. Then, the paperboards 1 stacked and stacked between the sheet stoppers (backstops) 3 configured to be able to move back and forth,
The frictional force Fo on the peripheral surface of the roll 4 is sequentially fed from the lowest layer 1a.
In the lead edge feeder configured to carry out between the field rolls 5a, 5b on the downstream side by the same rotation, when the paperboard dimension exceeds a predetermined length, the height H of the sheet stopper 3 is linked with the length variation. The tilt angle θ is automatically variable. As a mechanism for changing the height and the inclination angle of the seat stopper 3, a combination mechanism of a cam, a link, a pneumatic mechanism and the like can be considered, but the mechanism is not limited to these. In the figure, 6 is a suction box, which forms a negative pressure region in the box 6 by the suction action force of the suction blower 8 connected through the duct 7, and feeds the lower surface of the front end of the lowermost sheet 1a to the circumference of the roll 4. It functions to bring the surface into contact with a predetermined pressure. The function of the suction box 6 is similar to that of the well-known type described in the conventional example.

Reference numeral 9 is an endless gear that meshes with a gear 10 of a conventional type device, a pulley 12 fixed to the gear 11, guide pulleys 13a and 13b, and a tension pulley 14 that are wound and run in synchronization with the peripheral speed of a delivery roll 4. Belt (intermediate conveyor)
Is. This endless belt 9 is used for the delivery roll 4
It can be replaced by arranging a roll 15 that rotates in synchronization with the peripheral speed of the sheet, and functions to increase the sheet conveying force f by contacting the lowermost bottom surface of the long corrugated cardboard sheet and rotating it. ing.

Next, the operation of the paper feeder of the present invention will be described with reference to FIG. The deformed (upwardly warped) lowermost corrugated cardboard sheets 1a in the conventional paper feeder are stacked on the paper feed table 16 in a state as indicated by the alternate long and short dash line in the figure. Therefore, a gap of a substantially v-shaped surface formed by the warp of the corrugated cardboard sheet 1a is formed on the upper surface of the suction box 6, and the outside air freely flows in. Due to this air inflow, it is not possible to increase the sheet suction force due to negative pressure (or it takes time to suck).
As a result, the frictional force Fo of the delivery roll 4 becomes small, and the carrying output f acting on the sheet becomes weak. Further, as shown in FIG. 2B, with respect to the sheet 1 having a large amount of deformation, the leading end hits the lower end of the front guide 2 and the sheet cannot be conveyed downstream.

In view of the above-mentioned conventional problems, the present invention raises the rear end side of the corrugated cardboard sheet 1 in accordance with the sheet length as shown by the solid line in FIG. It is characterized in that it is corrected for close engagement (along with) the upper surface. This allows the bottom sheet
Since the frictional force Fo between the 1a and the peripheral surface of the delivery roll 4 can be increased, not only the sheet conveying force f becomes stable (stronger) and the sheet feeding becomes reliable, but also the accuracy of the sheet feeding timing is improved. You can In addition, the same function eliminates the need for manual correction work for sheet deformation.

(Effects of the Invention) The present invention is configured as described in detail above, and a mechanism for automatically elevating and inclining the sheet stopper corresponding to the length of the corrugated cardboard sheet is provided.
The lower surface of the front end of the paperboard can be easily brought into close contact with the upper surface of the suction box even with respect to the deformed sheet (especially warp), and thus the suction force is stabilized (reliable). In addition, since the lower surface of the sheet can be stably brought into contact with the feed roll, the conveyance force becomes stronger, the variation in the paper feed timing can be reduced, and the machine operation rate can be improved and the printing can be performed. It is possible to improve quality (processing accuracy) in subsequent steps.

[Brief description of drawings]

FIG. 1 is a side view for explaining the structure of a paperboard feeding device showing an embodiment of the present invention, FIG. 2 is an explanatory view of the function of the paperboard feeding device, and FIG. 3 is a structure of a conventional paperboard feeding device. FIG. 4 and FIG. 5 are side views showing a defect phenomenon of the conventional paperboard feeder. Description of main parts of the figure 1 …… Corrugated sheet 2 …… Front guide 3 …… Sheet stop (backstop) 4 …… Sending roll 5a, 5b …… Feed roll 6 …… Suction box 7 …… Duct 8 …… Suction Blower 9 …… Endless belt 10 …… Gear 11 …… Gear 12 …… Pulley 13a, 13b …… Guide pulley 14 …… Tension pulley 15 …… Roll 16 …… Paper feeding table

Claims (1)

[Scope of utility model registration request] 1. A stack of paperboard is successively carried out from the lowermost layer between a front guide and a sheet stopper supporting a rear end portion of the paperboard configured to be movable back and forth according to the length of the paperboard to be stacked. In a paper feeding device equipped with a feeding roll, when the paperboard dimension exceeds a predetermined length, a mechanism for automatically raising and lowering and tilting the sheet stopper is provided in association with the length variation. Paper feeder.